fix regression

LeStorage/StoredCollection.swift

@@ -200,6 +200,7 @@ public class StoredCollection<T: Storable>: SomeCollection {
     
     /// Sets a collection of items and indexes them
     func setItems(_ items: [T]) {
+        self.items.removeAll()
         for item in items {
             self.addItem(instance: item)
         }